New York Fashion Week ended with a fashionable bang last night, with some of our favorites donning their best looks for Thursday evening's festivities. Jessica Alba, who made a number of chic appearances at shows and parties this week, ended with a must-see look at a Piperlime event. Meanwhile, both Joan Smalls and Hilary Rhoda opted for Prabal Gurung numbers for the Estee Lauder Modern Muse launch party.